Sarah Palin’s family attorney John Tiemessen has written a letter to Maya Mavjee, the publisher of the Crown Publishing Group, a division of Random House, that Palin may sue her, the company, and the book’s author Joe McGinniss “for knowingly publishing false statements” in his book released last week, “The Rogue,” ABC News has learned.

The book was widely panned by critics for using unnamed sources to criticize Palin and her family. Tiemessen cites an email they have access to in which McGinniss writes that attorneys from Crown Publishing told him “nothing I can cite other than my own reporting rises above the level of tawdry gossip. The proof is always just around the corner, but that is a corner nobody has been able to turn” and that McGinniss “ran out of time” to sufficiently source the book.

A source close to the Palins tells ABC News that the “Palins are fighting back and demanding answers from Random House.”

“Random House is at the top of the food chain and published a book based upon acknowledged unsubstantiated gossip,” the source said. “The revealing email is key as evidence of this defamatory approach to politics through proxies.”

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